School-aged children's depressive rumination is associated with their reactivity to sadness but not fear

It is well documented that a ruminative response style is associated with greater risk for depression in children and adults. Less is known about the association between rumination and stress reactivity, particularly among children. Similarly, the extent to which depressive rumination is associated with general reactivity to negative emotion, or more specifically to sadness, has not received sufficient attention. The current study examines the association between depressive rumination and stress reactivity in response to a mild laboratory stressor in school-aged children. A diverse sample of 94 children between the ages of 8 and 12 participated in this 2-session study in which they reported on their tendency to engage in depressive rumination. Children's cardiovascular reactivity (operationalized as respiratory sinus arrhythmia) was assessed while they completed a task in which they read vignettes depicting children experiencing sadness and fear. Children also reported on their emotional reaction to the sad and fear vignettes, and we assessed the length of time it took them to respond to these questions (reaction time). Rumination was associated with greater decreases in respiratory sinus arrhythmia and greater increases in self-reported negative emotion in response to the sad but not the fear vignettes, suggesting that children higher in depressive rumination experienced more subjective arousal and showed evidence of greater regulatory effort when contemplating sadness. Rumination was associated with slower reaction time to both types of vignettes in one condition of the paradigm only. Results are discussed in terms of their implications for rumination and stress reactivity.